<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>R: Grunfeld's Investment Data</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" type="text/css" href="R.css" />
</head><body>

<table width="100%" summary="page for Grunfeld"><tr><td>Grunfeld</td><td style="text-align: right;">R Documentation</td></tr></table>

<h2>Grunfeld's Investment Data</h2>

<h3>Description</h3>

<p>A balanced panel of 10 observational units (firms) from 1935 to 1954
</p>


<h3>Format</h3>

<p>A data frame containing :
</p>

<dl>
<dt>firm</dt><dd><p>observation</p>
</dd>
<dt>year</dt><dd><p>date</p>
</dd>
<dt>inv</dt><dd><p>gross Investment</p>
</dd>
<dt>value</dt><dd><p>value of the firm</p>
</dd>
<dt>capital</dt><dd><p>stock of plant and equipment</p>
</dd> </dl>


<h3>Details</h3>

<p><em>total number of observations</em> : 200
</p>
<p><em>observation</em> : production units
</p>
<p><em>country</em> : United States
</p>


<h3>Note</h3>

<p>The Grunfeld data as provided in package <code>plm</code> is the
same data as used in Baltagi (2001), see <strong>Examples</strong> below.
</p>
<p>NB:<br /> Various versions of the Grunfeld data circulate
online. Also, various text books (and also varying among editions)
and papers use different subsets of the original Grunfeld data,
some of which contain errors in a few data points compared to the
original data used by Grunfeld (1958) in his PhD thesis. See
Kleiber/Zeileis (2010) and its accompanying website for a
comparison of various Grunfeld data sets in use.
</p>


<h3>Source</h3>

<p>Online complements to Baltagi (2001):
</p>
<p><a href="http://www.wiley.com/legacy/wileychi/baltagi/">http://www.wiley.com/legacy/wileychi/baltagi/</a>
</p>
<p><a href="http://www.wiley.com/legacy/wileychi/baltagi/supp/Grunfeld.fil">http://www.wiley.com/legacy/wileychi/baltagi/supp/Grunfeld.fil</a>
</p>
<p>Online complements to Baltagi (2013):
</p>
<p><a href="http://bcs.wiley.com/he-bcs/Books?action=resource&amp;bcsId=4338&amp;itemId=1118672321&amp;resourceId=13452">http://bcs.wiley.com/he-bcs/Books?action=resource&amp;bcsId=4338&amp;itemId=1118672321&amp;resourceId=13452</a>
</p>


<h3>References</h3>

<p>Baltagi B (2001).
<em>Econometric Analysis of Panel Data</em>, 3rd edition.
John Wiley and Sons ltd.
</p>
<p>Baltagi B (2013).
<em>Econometric Analysis of Panel Data</em>, 5th edition.
John Wiley and Sons ltd.
</p>
<p>Grunfeld Y (1958).
<em>The determinants of corporate investment</em>.
Ph.D. thesis, Department of Economics, University of Chicago.
</p>
<p>Kleiber C, Zeileis A (2010).
&ldquo;The Grunfeld Data at 50.&rdquo;
<em>German Economic Review</em>, <b>11</b>, 404-417.
<a href="https://EconPapers.repec.org/RePEc:bla:germec:v:11:y:2010:i::p:404-417">https://EconPapers.repec.org/RePEc:bla:germec:v:11:y:2010:i::p:404-417</a>.
</p>
<p>website accompanying the paper with various variants of the
Grunfeld data:
<a href="https://eeecon.uibk.ac.at/~zeileis/grunfeld/">https://eeecon.uibk.ac.at/~zeileis/grunfeld/</a>.
</p>


<h3>See Also</h3>

<p>For the complete Grunfeld data (11 firms), see
AER::Grunfeld, in the <code>AER</code> package.
</p>


<h3>Examples</h3>

<pre>

## Not run: 
# Compare plm's Grunfeld data to Baltagi's (2001) Grunfeld data:
  data("Grunfeld", package="plm")
  Grunfeld_baltagi2001 &lt;- read.csv("http://www.wiley.com/legacy/wileychi/
    baltagi/supp/Grunfeld.fil", sep="", header = FALSE)
  library(compare)
  compare::compare(Grunfeld, Grunfeld_baltagi2001, allowAll = T) # same data set
  
## End(Not run)

</pre>


</body></html>
